MESON Chess Problem Database
Problem Display
PID: 101163 (8/4p3/2n1P3/1N3pP1/2PPk3/3prb2/3B3Q/5RK1 w - - 0 1)
O'Keefe, John James
Good Companions, 1920
#2
9 + 7
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Re1
- 2.Qf4#
- 1...Re2
- 2.Qf4#
- 1...Bd1
- 2.Rf4#
- 2.Qf4#
- 1...Bh1
- 2.Rf4#
- 2.Qf4#
- 1...Be2
- 2.Rf4#
- 2.Qf4#
- 1...Bg2
- 2.Rf4#
- 2.Qf4#
- 1...Bg4
- 2.Rf4#
- 2.Qf4#
- 1...Bh5
- 2.Rf4#
- 2.Qf4#
- 1...Sb4
- 2.Qe5#
- 1...Sxd4
- 2.Sc3#
- 1...Sa5
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Sa7
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sd8
- 2.Qe5#
- 1...f4
- 2.Qh7#
- 1...Re1
- Tries
- 1.Bc1?
- 1...Sxd4
- 2.Sc3#
- 1...f4
- 2.Qh7#
- 1...Re1
- 2.Qf4#
- 1...Re2
- 2.Qf4#
- 1...Bd1
- 2.Rf4#
- 2.Qf4#
- 1...Bh1
- 2.Rf4#
- 2.Qf4#
- 1...Be2
- 2.Rf4#
- 2.Qf4#
- 1...Bg2
- 2.Rf4#
- 2.Qf4#
- 1...Bg4
- 2.Rf4#
- 2.Qf4#
- 1...Bh5
- 2.Rf4#
- 2.Qf4#
- 1...Sb4
- 2.Qe5#
- 1...Sa5
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Sa7
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sd8
- 2.Qe5#
- 1...d2!
- 1...Sxd4
- 1.Rf2?
- 1...Sxd4
- 2.Sc3#
- 1...f4
- 2.Qh7#
- 1...Re2
- 2.Qf4#
- 1...Bd1
- 2.Rf4#
- 2.Qf4#
- 1...Bh1
- 2.Rf4#
- 2.Qf4#
- 1...Be2
- 2.Rf4#
- 2.Qf4#
- 1...Bg2
- 2.Rf4#
- 2.Qf4#
- 1...Bg4
- 2.Rf4#
- 2.Qf4#
- 1...Bh5
- 2.Rf4#
- 2.Qf4#
- 1...Sb4
- 2.Qe5#
- 1...Sa5
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Sa7
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sd8
- 2.Qe5#
- 1...Re1+!
- 1...Sxd4
- 1.Qg3?
- 1...Sxd4
- 2.Sc3#
- 1...Re1
- 2.Qf4#
- 2.Qxf3#
- 1...Re2
- 2.Qf4#
- 2.Qxf3#
- 1...Bd1
- 2.Rf4#
- 2.Qf4#
- 2.Qxe3#
- 1...Bh1
- 2.Rf4#
- 2.Qf4#
- 2.Qxe3#
- 1...Be2
- 2.Rf4#
- 2.Qf4#
- 2.Qxe3#
- 1...Bg2
- 2.Rf4#
- 2.Qf4#
- 2.Qxe3#
- 1...Bg4
- 2.Rf4#
- 2.Qf4#
- 2.Qxe3#
- 1...Bh5
- 2.Rf4#
- 2.Qf4#
- 2.Qxe3#
- 1...Sb4
- 2.Qe5#
- 1...Sa5
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Sa7
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sd8
- 2.Qe5#
- 1...f4!
- 1...Sxd4
- 1.Qd6?
- threat
- 2.Sc3#
- 1...Se5
- 2.Qxe5#
- 1...f4
- 2.Qd5#
- 1...exd6!
- threat
- 1.Qc7?
- 1...Sxd4
- 2.Sc3#
- 1...Se5
- 2.Qxe5#
- 1...Re1
- 2.Qf4#
- 2.Qxc6#
- 1...Re2
- 2.Qf4#
- 2.Qxc6#
- 1...Bd1
- 2.Rf4#
- 2.Qf4#
- 2.Qxc6#
- 1...Bh1
- 2.Rf4#
- 2.Qf4#
- 2.Qxc6#
- 1...Be2
- 2.Rf4#
- 2.Qf4#
- 2.Qxc6#
- 1...Bg2
- 2.Rf4#
- 2.Qf4#
- 2.Qxc6#
- 1...Bg4
- 2.Rf4#
- 2.Qf4#
- 2.Qxc6#
- 1...Bh5
- 2.Rf4#
- 2.Qf4#
- 2.Qxc6#
- 1...Sb4
- 2.Qe5#
- 1...Sa5
- 2.Qe5#
- 1...Sa7
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sd8
- 2.Qe5#
- 1...f4!
- 1...Sxd4
- 1.Qf2?
- threat
- 2.Qxe3#
- 1...Kf4
- 2.Qh4#
- 1...Re1
- 2.Sc3#
- 2.Qxf3#
- 1...Re2
- 2.Sc3#
- 2.Qxf3#
- 1...f4!
- threat
- 1.Qh4+?
- 1...f4
- 2.Qh7#
- 1...Bg4!
- 1...f4
- 1.g6?
- 1...Sxd4
- 2.Sc3#
- 1...Sb4
- 2.Qe5#
- 1...Re1
- 2.Qf4#
- 1...Re2
- 2.Qf4#
- 1...Bd1
- 2.Rf4#
- 2.Qf4#
- 1...Bh1
- 2.Rf4#
- 2.Qf4#
- 1...Be2
- 2.Rf4#
- 2.Qf4#
- 1...Bg2
- 2.Rf4#
- 2.Qf4#
- 1...Bg4
- 2.Rf4#
- 2.Qf4#
- 1...Bh5
- 2.Rf4#
- 2.Qf4#
- 1...Sa5
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Sa7
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sd8
- 2.Qe5#
- 1...f4!
- 1...Sxd4
- 1.Bc1?
- Keys
- 1.Qh8!
- 1...Kf4
- 2.Qh4#
- 1...Sxd4
- 2.Qxd4#
- 1...Re1
- 2.Sc3#
- 1...Re2
- 2.Sc3#
- 1...Bd1
- 2.Sc3#
- 1...Bh1
- 2.Sc3#
- 1...Be2
- 2.Sc3#
- 1...Bg2
- 2.Sc3#
- 1...Bg4
- 2.Sc3#
- 1...Bh5
- 2.Sc3#
- 1...Sb4
- 2.Qe5#
- 1...Sa5
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Sa7
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sd8
- 2.Qe5#
- 1...f4
- 2.Qh7#
- 1...Kf4
- 1.Qh8!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 3
- ADDED MATES = 7
- REMOVED MATES = 0
- Sets
- R(b);P_PINR(A)::QAR1(D)
- R(b);::QAR1(D)
- S(f);N_GUARD::QAR1(D)
- S(f);SBLOCK,XP(F)::S(G)
- S(f);N_GUARD::QAR1(D),XS(f)
- P(e);OGATEB,SBLOCK::QAB(D)
- Tries
- Try
- B(C);
- Vars
- S(f);SBLOCK,XP(F)::S(G)
- P(e);OGATEB,SBLOCK::QAB(D)
- R(b);P_PINR(A)::QAR1(D)
- R(b);::QAR1(D)
- S(f);N_GUARD::QAR1(D)
- S(f);N_GUARD::QAR1(D),XS(f)
- Refutation
- P(a);
- Try
- R(A);
- Vars
- S(f);SBLOCK,XP(F)::S(G)
- P(e);OGATEB,SBLOCK::QAB(D)
- R(b);::QAR1(D)
- S(f);N_GUARD::QAR1(D)
- S(f);N_GUARD::QAR1(D),XS(f)
- Refutation
- R(b);CHECK
- Try
- Q(D);
- Vars
- S(f);SBLOCK,XP(F)::S(G)
- S(f);N_GUARD::QAR1(D)
- S(f);N_GUARD::QAR1(D),XS(f)
- Refutation
- P(e);
- Try
- Q(D);
- Threat
- S(G)
- Vars
- S(f);N_GUARD::QAR1(D),XS(f)
- P(e);SBLOCK::QAB1(D)
- Refutation
- P(g);XQ(D)
- Try
- Q(D);
- Vars
- S(f);SBLOCK,XP(F)::S(G)
- S(f);N_GUARD::QAR1(D),XS(f)
- S(f);N_GUARD::QAR1(D)
- Refutation
- P(e);
- Try
- Q(D);
- Threat
- QAR1(D),XR(b)
- Vars
- K(d);P-FLIGHT,P_SPINB(c),P_SPINR(b)::QAR2(D)
- Refutation
- P(e);
- Try
- Q(D);CHECK
- Vars
- P(e);OGATEB,P_SPINP(e),SBLOCK::QAB(D)
- Refutation
- B(c);P_SPINB(c)
- Try
- P(H);
- Vars
- S(f);SBLOCK,XP(F)::S(G)
- S(f);N_GUARD::QAR1(D)
- R(b);P_PINR(A)::QAR1(D)
- R(b);::QAR1(D)
- S(f);N_GUARD::QAR1(D),XS(f)
- Refutation
- P(e);
- Try
- Actual
- Q(D);
- Vars
- K(d);P-FLIGHT,P_SPINB(c),P_SPINR(b)::QAR2(D)
- S(f);OGATE,XP(F)::QAR1(D),XS(f)
- R(b);P_PINR(A)::S(G)
- R(b);::S(G)
- B(c);::S(G)
- S(f);N_GUARD::QAR1(D)
- S(f);N_GUARD::QAR1(D),XS(f)
- P(e);OGATEB,SBLOCK::QAB(D)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).